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registry defrag (mistake) need help fixing

I recently ran a registry defrag with advanced system care. Afterwards my computer ran extremely slow, now it can barley boot up. I tried to do a system refresh, but it was unable to do that. It said it was missing files. So, I was wondering if there is anything I can do other then reinstalling windows. I would like to keep all my programs and files as well.

And this is exactly why Registry Cleaners should never be used, nor should IObit software be used at all. All they do is causing issues on a Windows system and add bloat. They aren't worth using at all. Did you check in the IObit folder if a back up of your Registry was made before that operation? If it did, you could restore it.

And this is exactly why Registry Cleaners should never be used, nor should IObit software be used at all. All they do is causing issues on a Windows system and add bloat. They aren't worth using at all. Did you check in the IObit folder if a back up of your Registry was made before that operation? If it did, you could restore it.

I have found the IObit folder, where would I find a backup of my registry?

Unlike registry cleaners, registry defragmentation typically consists of performing a physical defragmentation and compacting of the Windows registry in order to remove slack space which reduces the registry size. Whether degragmenting the registry will improve performance is debatable but any changes made to the registry after a defrag are lost when the computer is restarted.

What most people don't realize, however, is that your registry is fully loaded into RAM when your system boots, meaning all reads and writes to the registry are done directly to memory, and then loaded to the disk later. So while you're going to gain some slight performance gain by making sure your registry isn't too fragmented, the reality is that your system isn't going to suddenly be blazing fast because you defragged your registry.

IMO using a registry defragmenter is not really necessary but you may get differing opinions since some folks like to use such utilities.

However, some registry cleaners which include degragmentation features, may peform other optimizing actions which claim to speed up your computer by finding and removing orphaned and corrupt registry entries that are responsible for slowing down system performance. There is no statistical evidence to back such claims. Further, using registry cleaners unnecessarily or incorrectly is dangerous and could lead to disastrous effects on your operating system such as preventing it from ever starting again.

Bleeping Computer DOES NOT recommend the use of registry cleaners/optimizers for several reasons.